Means for holding diamonds during the polishing operation



C. I. COLEMAN.

MEANS FOR HOLDING DIAMONDS DURING THE POLISHING OPERATION.

APPLICATION FILED IULYZO, I912.

'1 329,37 1. Patented Feb. 3, 1,920.

srarnsr grnnr OFFICE.

CLYDE J. comm, or NEW ROCHELLE, NEW YORK, assrcnoa, BY mnsnn ASSIGN-mnnrs, r0 s'rnnn-cotnmm mnmozm maonmn ooMrANY, me, A coarona'rron or NEWYou. L

MEANS FOR HOLDING DIAMONDS'DUBING THE POLISHING OPERATION.

Patented Feb. 3, 1920.

Application filed my 20, 1912. Serial No. 710,622.

.'I '0 all whom it may concern:

Be it known that I, CLYDE J. COLEMAN, a citizen of the United States,residing at New Rochelle, in the county of Westchester and State of NewYork, have invented a certain new and useful Improvement in Means forHolding Diamonds During the Polishing Operation, of which the followingis a specification, reference being had therein to the accompanyingdrawings, forming part thereof.

My invention relates to the art of polishing diamonds, and relates moreparticularly to means for holding the diamond during the polishingoperation. Objects of my invention are to securely hold the diamond withexposure for polishing of all parts above or below the girdle of thediamond,

and to save time in attaching and in releasing the diamond from itsholder, and to do away to a large extent with the skilled manipulationnow necessary in diamond polishing operations. My present invention isanother specific form of-the invention broadly claimed in my applicationfor patent filed on even date herewith, Serial Number 710,- 621. Mypresent invention includes an arbor of a refractory material havingsubstantially the same coeflicient of expansion as the diamond holdingcement and a fusible diamondholding cement for attaching the diamond tothe arbor, such cement being only fusible, however, at a temperaturehigher than that evolved in the diamond polishing operation. Morespecifically my invention includes an arbor of porcelain or the like anda cement of silicious adhesive enamel. These materials being heatresistant above the temperature produced in polishing the diamond andalso having substantially the same coefficient of expansion as thediamond or sufficient elasticity or give, preclude the possibility ofthe diamond becoming loosened by the heat evolved in the polishingoperation.

I shall now describe my invention with reference to the accompanyindrawings illustrating one embodiment t ereof, and shall thereafter pointout my invention'in claims.

Figure 1 is an elevation, partly in vertical section, of a diamondvholder embodying my. invention, and shows a diamond held in positionforpolishing upon a-polishing lap.

composed of porcelain, glass, quartz or other suitable material, eithera clay product or of a vitreous nature. This arbor is shown as oftapered "form and slightly cup shaped at its larger end, and to thiscup-shaped end the diamond 1 is attached by means of a body 3 of afusible cement. This body of cement may be composed of any suitablefusible substance which is fusible only at a higher temperature thanthat evolved during the diamond polishing operation, such as powderedsilica (commercially known as quartz) combined with boracic acid, or aphosphatic dental cement, or zinc oxidenamels, or a combination of acalcium oxid and borax forming a silicious cement. In Fig. 2 thediamond, cement and arbor are shown as in position ready for thecementing operation to take place. Fig. 3 illustrates the completion ofthe cementing operation in which the body of fusible cement and thearbor have been fused together to form a single integral mass, to theend of which the diamond 1 is adhesively attached.

During the polishing operation, as illustrated in Fig. 1, the taperedarbor 2 is contained in a slightly flaring socket in a dop head 4provided with a tubular dop-holding stem or shank 5, through which adrift pin may be driven to loosen the arbor from its socket when it isdesired to do so.

Any suitable tool for holding the dop and enabling the diamond to bepressed against the polishing lap 6 may be employed, that illustrated inFig. 1 being a common form whose construction and operation will bereadily understood Without the necessity of a particular descriptionthereof.

It is obvious that various modifications may be made in the constructionshown and above particularly described within the principle and scope ofmy invention.

I claim 1. Means for holding a diamond during polishing thereofcomprising an arbor, and

a body of silicious cement for holding the diamond on the arbor byadhesionduring substantially the same coeflicient of expansion as thecement and to which the cement is attached by adhesion to hold thediamond.

on the arbor. v

3. Means for holding a diamond during polishing thereof comprising asilicious cement for holding the diamond, and a porcelain arbor to whichthe cement is fused to hold the diamond on'the arbor.

I 2 Witnesses:

4. Means for holding a diamond during polishing thereof comprising aporcelain arbor, and an adhesive enamel interposed between the diamondand arbor for adhesively holding the diamond to the arbor.

' 5. Means for-holding .a diamond durin polishing thereof comprisinga-fusible sillcious cement for holding the diamond, such cement beingfusible at a higher temperature than that evolved in the diamondpolishing operation, and an arbor having resistance to heat above thatevolved in diamond polishing and to which the cement is attached byadhesion to hold the diamond on the arbor. In testimony whereof I haveafiixed' my signature in presence of two witnesses.

CLYDE J. COLEMAN.

WM. ASHLEY KELLY, VICTOR D. BAIST.

